Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach thu » sach thue, sach thieu, sach tham
dang xay » dang van, van xay
ban hanh » ban hang
hanh hai » thanh hai, nhanh hai, hang hai
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ang xa » lang xa, mang xa, hoang xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thu ((ang xa) or (dang xay)) hoi. hieu va cac duc ban hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thu ((ang xa) OR (dang xay)) hoi. hieu va cac duc ban hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach thu ((ang xa) or (dang xay)) hoi. hieu va cac duc ban hanh hai cua tre*.